spkennyuk
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The H pipe in the picture below is one i had made for my 4200 with the 2 x resonators. It will cut down the drone and may also shift the rev range the drone appears at.curious as well, been looking into getting a H fabricated. Sportscats and the larini x-pipe was too loud, as Larini themselfs said. So maybe the H woudl be a nice addition. Also would like ot try and see if the double resonators reduce drone a bit.
Yours is a GranTurismo but the effect of adding resonators to a H-pipe on the GT should be similar.